Locking cap



FIG. 1 is a top perspective view of a locking cap, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof; and,

FIG. 4 is a front elevational view thereof, showing an exemplary bottle in dashed lines.

Subject matter illustrated in dashed lines depicts environmental subject matter only and does not form part of the claim. 

The ornamental design for a locking cap, as shown and described. 